Process for the preparation of letters, figures, and like signs for fixing to windows and the like



F. K. KREISEL July 30, 1929. PROCESS FOR THE PREPARATION or wr'rz-ms, FIGURES, AND

LIKE SIGNS FOR FIXING T0 WINDOWS AND THE LIKE Filed Jan. 23-, 1928 Patented July 30, 1929.

UNITED STATESPATENT OFFICE.

FRANZ KARL KREISEL, OF KONIGSTEIN-ONTHE-ELBE, GERMANY.

PROOESS FOR THE PREPARATION OF LETTERS, FIGURES, AND LIKE SIGNS FOR FIXING TO WINDOWS AND THE LIKE.

Application filed January 23, 1928.

The device of providing letters, figures and the like with a fiat back surface and applying to this back surface an adhesive medium which enables the letters and figures to be attached to such surfaces as windows, houses, walls and the like is known. This processis based upon the employment of an adhesive medium which on the one hand is permanently connected with the letters, figures, or the like, but on the other hand enables these signs to be used repeatedly, so that they can be removed from the first place to which they were attached and fastened afresh to some other place. When that is to be done the material must of course have sufficient adhesive power, but on the other hand must also be sufficiently capable of resisting the influence of moisture, heat and cold. Suitable materials for these purposes are already known.

For satisfactory adhesion two conditions must be fulfilled, namely that the adhering surface of the layer of adhesive medium applied to the back of the letters must be completely so shaped that in all its parts it exer cises so to speak a suction effect on the surface, such as a pane of glass, to which it is to be caused to adhere. Secondly, however, provision must be made to guard against the danger of the letters dropping off as a result of certain influences to which they are liable to be subjected.

According to the present invention the adhesive medium is applied to the rear side of the letter, figure or the like sign in a comparatively thick layer, and the letter or the like is pressed during solidification on to a fiat plate, the said plate being equipped with projecting pegs or the like. In this way two results are obtained. The adhering surface is made flat and smooth, and at the same time, in the solidified mass of adhesive medium, recesses extending inwards from the adhering surface are produced, which serve so to speak as suckers, that is, which exert a suction effeet on a wall surface when the letter or the like is placed thereon.

In the accompanying drawings Fig. 1 shows a letter as seen from the front.

Fig. 2 is a cross sectional elevation thereof on the line 22 in Fig. 1.

Fig. 3 is an end view of the letter, looking in the direction. of the arrow shown in Fig. 1.

Fig. 4 is a horizontal cross section on the Serial No. 248,935.

line 4.4 in Fig. 1, showing the letter in contact with the pressing plate.

The front a of the letter, which may for example be made of glass, may be flat, convex, or of any other form, while the back 6 of the letter is to be made as flat as possible. To this back is applied the adhesive medium, this being put on in a comparatively thick layer, as indicated in Figures 2 and 3 in dotted lines. This layer is marked 0 in Fig. at. Thus the layer 0, consisting of a viscous adhesive material, is placed on the'back b of the letter and is allowed to solidify to a certain extent without, however, completely los- 1ng its adhesive power.

A suitable material for these purposes may consist for example of 25 parts of water, 27 parts of syrup, 23 parts of glue, and 25 parts of glycerine.

N ow it is important that the adhering surface (Z should be completely plane, this result being obtained by means of a plate 0, the surface f of which is suitably plane and smooth. By compressing the adhesive medi um between the two plates, one consisting of the letter itself and the other of the plate 6, suflicient pressure is exerted upon the adhesive medium to convert the adhesive surface into a plane form.

On the plate 6 are provided pegs or the like 9 projecting above its surface f, and these pegs, when the adhesive medium is being compressed, penetrate into the latter, thereby producing cavities extending from the adhering surface 03 into the layer of ad hesive medium when the plate 6 is removed. These recesses form suckers which materially assist the action of the adhesive medium in holding the layers or like signs in close contact with plane surfaces, such as windows.

In order that the pegs g may not remain fixed in the body of the adhesive medium when the latter solidifies they are previously coated with a layer of a material such as oil, which is adapted to prevent the adhesive medium from adhering thereto.

The cavities produced by the pegs g are arranged in suitable numbers and at suitable distances from one another, as indicated by way of example in Figure 1 by the dotted circles.

What I claim is 1. A. process for the preparation of letters, figures and like signs that are to caused to adhere .to WiIlClOWS, Walls and the like, comprising applying a thick layer of adhesive to the rear side of the sign, pressing against the surface of said adhesive a smooth'plate having projections in its surface, so as to impart to the adhesive a plane surface having recesses here and there.

2. A process for the preparation of letters, figures and like signs that are to be caused to adhere to Windows, Walls and the like, comprising applying a slllliCk layer of adhesive to the rear side of the sign, pressing against the surface of said adhesive a smooth plate having projections in its surface, so as to impart to the adhesive a plane surface having recesses here and there, said projections being first coated with a layer of a material adapted to prevent theadhesive from adhering :to said projections.

3. A process for the preparation of letters, figures and like signs that are to he caused to adhere to windows, Walls and the like, co1nprising applying a thick layer of adhesive to the rear side of the sign, pressing against the surface of said adhesive a smooth plate having projections in its surface, so as to impart to the adhesive a plane surface having recesses here and there, and allowing said adhesive .to solidify.

4. A process for the preparation of letters, figures and like signs that are to be caused to adhere to Windows, walls and the like, comprising applying a thick layer of adhesive to the rear side of the sign, pressing against the surface of said adhesive a smooth plate having projections in its surface, so as to impart to the-adhesive a plane surface having recesses here and there, said projections being first coated With a layer of a material adapted .to prevent the adhesive froin adhering to said projections, and allowing said adhesive to solidify.

In testimony whereof I have signed my name to this specification.

FRANZ KARL KREISEL. 

